D21 Hardbody 2WD V6-2960cc 3.0L SOHC MFI (VG30E) (1991)
Vehicle Speed Sensor: Component Tests and General Diagnostics
Vehicle Speed Sensor Test
1.
Remove instrument cluster.
2.
Disconnect the speedometer cable.
3.
Using an ohm meter, check continuity across terminals as shown while turning sensor with a small screwdriver.
Continuity should open and close twice per revolution.
Replace sensor if it fails the above test.